Hurco BMC20 Dynomotion Retrofit - Page 3


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Thread: Hurco BMC20 Dynomotion Retrofit

  1. #25
    Registered Need TECH Help!'s Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    So do u think that +/- 10vdc is just as noise immune as step, Dir?

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  2. #26
    Registered Jim Dawson's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Looks like I need to actually read my Kflop/Kanalog documentation again. It's been a few years since I have looked at it. I have only installed one on a customer machine, and that was a few years ago.

    I have found that the analog motor command signal to be very reliable. I have had very good luck with magnetic scales on the table, had them on my machines for a few years now. And the real advantage is the backlash (within reason) and any lead screw error is automatically compensated. I have no encoders on the leadscrew or motors.



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Analog should be far more tolerant than single ended step/dir, however it can be a bit more effort to set up and tune well.

    Running step/dir and having encoder feedback to the kflop, would mean any noise problems should be detected, whereas if you're running blind, then axes can still drift.
    It's worth noting that even if you run step/dir with encoder feedback to the kflop, the kflop won't compensate for lost steps. It'll simply result in the following error increasing. I've got a small digitising machine running closed loop with a KStep and linear scales, and if you stall/manually move a stepper, it is not compensated for. It simply increases the following error until it reaches the limit and disables.

    The key to noise immunity, is good grounding practise, and differential wiring.



  4. #28
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Quote Originally Posted by m_c View Post
    ...I've got a small digitising machine running closed loop with a KStep and linear scales, and if you stall/manually move a stepper, it is not compensated for. It simply increases the following error until it reaches the limit and disables.
    .....
    Not sure i follow what you are saying here as i had a knee mill with steppers and glass scales and loop was closed so that KFLOP would compensate. If i cut a 1.0" circle in open loop the circle would be around .002-.003 out of round. Running this with Closed Loop turned on the circle would be within .001" round and on size.

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  5. #29
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    Default +/- 10V signal wiring

    The drive manual says to use twisted pair for the analog +/- 10v signal. Does this mean one pair for + pin and one pair for - pin? Using a total of 4 wires.

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  6. #30
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    Yes I think Analog Velocity Mode would be your best option. That is the simplest way to get dual loop operation when you go to Linear Scales. The Drive will form a velocity loop itself based on the rotary encoder and then KFLOP+Kanalog can close the Linear Scales Position Loop.

    The drive manual says to use twisted pair for the analog +/- 10v signal. Does this mean one pair for + pin and one pair for - pin? Using a total of 4 wires.
    No. Just use a single pair of wires. Connect the - pin to Kanalog GND and the + pin to a Kanalog DAC Output.

    HTH
    Regards

    TK
    http://dynomotion.com


  7. #31
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hay Tom,
    When i get ready to do dual loop, does the encoders on motors need to be wired to KFLOP/Kanalog also? There is a encoder output connector on drive. It is A+,A-,B+,B- and Z+,Z-. Was planing to at lest wire up the Z index for referencing of machine.

    Thanks,
    Troy

    http://www.homecncstuff.elementfx.com/


  8. #32
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    When i get ready to do dual loop, does the encoders on motors need to be wired to KFLOP/Kanalog also?
    No. The encoder on the motor can remain connected to the drive. The Drive will then be controlling the inner velocity loop. The Motor's Position will not need to be provided to KFLOP or Kanalog. The Drive will need to be tuned for good tight velocity control.

    There is a encoder output connector on drive. It is A+,A-,B+,B- and Z+,Z-. Was planing to at lest wire up the Z index for referencing of machine.
    Yes. When not using linear scales you can wire ABZ to Kanalog to close the position loop based on the motor's encoder. Later when using Linear Scales the AB from the Scales can be connected to Kanalog instead. The Z from the Drive can remain if desired and the Linear Scales don't have something better. The Z can be connected to any unused A or B input.

    HTH
    Regards

    TK
    http://dynomotion.com


  9. #33
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    Default Servo Drive Alarm output

    Still working on my wiring diagram for the servo drives. Now i am working on the Alarm output from servo drive.
    DYN4 pg 15 attachment is example from drive manual. They show a 1K ohm resistance that i dont understand. Is this the resistance of this pin? I dont understand how this circuit is supposed to work.

    How would i wire this ouput into Kanalog Opto input 0? Would minus side of 24VDC supply be wired to Pin 5 (COM) of drive, then Pin 18 of drive wired to Kanalog Opto 0 minus pin and plus side of 24VDC supply to Kanalog Opto 0 plus pin?

    Thanks for any help,
    Troy

    Attached Thumbnails Attached Thumbnails Hurco BMC20 Dynomotion Retrofit-dyn4-pg15-pdf  
    Last edited by Need TECH Help!; 03-25-2017 at 11:03 PM.
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  10. #34
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    Correct. As in the opto coupler diagram, Kanalog has the resistor built in.so no need to add it.

    Regards

    TK
    http://dynomotion.com


  11. #35
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Tom,
    If I was too wire to a Konnect input 0, would +24vdc go to J1 pin0 of Konnect, -24vdc to Pin5 (COM) of drive then Pin 18(Alarm) of drive to Konnect input 0?
    Troy

    http://www.homecncstuff.elementfx.com/


  12. #36
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Correct

    TK
    http://dynomotion.com


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